#include "apue.h"

#define BUFFSIZE 4096

int main(void)
{
    int n;
    char buf[BUFFSIZE];
    while ((n = read(STDIN_FILENO, buf, BUFFSIZE)) > 0)
    {
        if (write(STDOUT_FILENO, buf, n) != n)
            err_sys("write error");
    }
    if (n < 0)
        err_sys("read error");
    exit(0);
}
